A help on this command or AgentOptions would provide the options that you can specify on the agent. So, you could have multiple agents , each running with different configurations. Currently(Oct 2016), each Agent can only have one authentication configuration set. So, each Agent process can only write to streams on just one account. So, with separate config files you can send data to different accounts. The authentication for each agent can be using a IAM user credentials or with an Assumed Role.

With API Gateway, developers can create and operate APIs for their back-end services without developing and maintaining infrastructure to handle authorization and access control, traffic management, monitoring and analytics, version management, and software development kit (SDK) generation.

API Gateway is designed for web and mobile developers who are looking to provide secure, reliable access to back-end APIs for access from mobile apps, web apps, and server apps that are built internally or by third-party ecosystem partners. The business logic behind the APIs can either be provided by a publicly accessible endpoint API Gateway proxies call to, or it can be entirely run as a Lambda function.

In this article, we will create an Publicly accessible API endpoint on which your application can issue POST requests. Via Service proxy, the contents of this post request go to Firehose as PutRecord API call and eventually the data goes to S3/Redshift/ES-Cluster based on your Firehose settings. Usage of service proxy eliminates invoking an AWS Lambda function.

The end result would be :

1. Your application issues a POST request to the API gateway endpoint that you create –

2. The API gateway translates and authenticates this request as PutRecord API call via Service proxy and puts data “SampleDataStringToFirehose” into your Firehose.

3. The Firehose eventually hydrates the destination (Either S3 or Redshift) with the data from your POST requests.

Here’s step by step walkthrough on setting this up:

This walkthrough assumes you had explored other walkthrough’s in http://docs.aws.amazon.com/apigateway/latest/developerguide/getting-started-intro.html

1. Creating Gateway:

> Create an API Gateway by going through the web console.
> Create a resource under that API and create a POST method.
> In this method, choose integration type as Advanced and select “AWS Service Proxy”.
> Method settings:

Select desired Region,
Service as Firehose ,
Leave subdomain empty ,
Http Method -> POST,
Ation -> PutRecord
Role -> ARN of the role that can be assumed by API gateway and had policies to allow at-least ‘PutRecord’ action on your firehose. A sample role which allows all actions – is attached later.
Ex: arn:aws:iam::618548141234:role/RoleToAllowPUTsOnFirehose

3. Verify S3 contents:

Now if you see the S3 contents that the firehose is supposed to hydrate (after s3 buffer interval or Buffer size, which ever satisfied first) ,

The contents will be binary format like äﬁõÚ)≤ÈøäœÏäjeÀ˜nöløµÏm˛áˇ∂ø¶∏ß∂)‡ which isn’t the data that you just pushed via API call.

This is because the Firehose expects the datablob to be encoded in Base64. (This can be confirmed by running ( aws firehose put-record --delivery-stream-name test --debug --region us-west-2 --record Data=SampleDataStringToFirehose ) , which automatically encodes the data blob in base64 before sending the request ). While we mention ‘SampleDataStringToFirehose’ as data , we see AWS CLI actually sends ‘U2FtcGxlRGF0YVN0cmluZ1RvRmlyZWhvc2U=’

So, You need to apply transformations on your POST payload to encode the Data in base64.

You can use a $util variable like $util.base64Encode() to encode in base64 at the API Gateway layer.

4. Applying transformations:

Using transformations, you can modify the JSON schema during the request and response cycles.

By defining a mapping template, the request and response payloads can be transformed to reflect a custom schema.

For a request body like-

1

2

3

4

5

6

{

"DeliveryStreamName":"test",

"Record":{

"Data":"SampleDataStringToFirehose"

}

}

Here’s a sample mapping template that I created checking documentation (application/json):

1

2

3

4

5

6

{

"DeliveryStreamName":"$input.path('$.DeliveryStreamName')",

"Record":{

"Data":"$util.base64Encode($input.path('$.Record.Data'))"

}

}

Usage:

> While testing a Resource -> Integration Request -> Add mapping template -> Content-Type = application/json
> Instead of Input passthrough, use mapping template to paste your template and save.
> Now test with a request body similar to what you had used before, and Verify in the Logs section – “Method request body after transformations” ,
it should look like

1

2

3

4

5

6

{

"DeliveryStreamName":"test",

"Record":{

"Data":"VGVzdERhdGE="

}

}

> You may need to modify the mapping template, so that include whatever payload you want for your application.
> Instead of using these transformations on API GW, you can also choose your client to encode the data before framing a request to API GW.

5. Deployment:

Now that we have a working method that can issue PutRecord to Firehose, we deploy the API to get a publicly accessible HTTP endpoint to issue POST requests. Your application can issue POST requests on this Endpoint and contents of this post requests go to Firehose as PutRecord API call and eventually the data goes to S3/Redshift based on your firehose settings.

Make sure you include Content-Type: application/json header in the POST request. You can also try application/x-amz-json-1.1

Extend – You may extend the functionality to work with other API calls on other AWS Services required by your client App. Similar setup can be used to POST data to Kinesis streams from your Applications.